Preparation of Ni-Al2O3 Catalysts by Solution Combustion Method for CO2 Reforming of CH4

doi:10.15541/jim20150530

Abstract

Abstract:

Ni-Al₂O₃ catalysts with Ni loading of 2wt%, 4wt%, 6wt%, 8wt%, and 10wt% were prepared by solution combustion method for carbon dioxide reforming of methane to produce syngas, and characterized by N₂ adsorption-desorption method, XRD, H₂-TPR, TPH, Raman, TEM, and TG-DTG techniques. Results showed that all the catalysts preserved large specific surface areas and hierarchical pore size distributions (2-4.5 nm as one part and 4.5-10 nm as another part) as compared to 8IMNi-Al catalyst prepared by impregnation method (Al₂O₃ as support prepared by solution combustion method). NiO was highly dispersed in the Ni-Al₂O₃ catalysts, which combined with support with strong metal-support interaction (SMSI), improving the stability performance. The 210 h stability test of 8Ni-Al catalyst showed that conversion rate of CH₄ was around 90% with the deactivation rate of only 0.035%/h, lower than that of 8IMNi-Al catalyst within the 182 h endurance test. TG-DTG result demonstrated that carbon deposition rate of 8Ni-Al catalyst was only 0.34 mg/(h·g_cat), which was lower than that of 8IMNi-Al catalyst (0.80 mg/(h·g_cat)). Therefore, the Ni-Al₂O₃ catalyst prepared by solution combustion method presented well stability.

Key words: CO2 reforming of CH4, Ni-Al2O3 catalyst, syngas, solution combustion method

CLC Number:

O643

MO Wen-Long, MA Feng-Yun, LIU Yue-E, LIU Jing-Mei, ZHONG Mei, Aisha·Nulahong. Preparation of Ni-Al₂O₃Catalysts by Solution Combustion Method for CO₂ Reforming of CH₄[J]. Journal of Inorganic Materials, 2016, 31(5): 485-491.

Figures/Tables 8

Table 1 Specific surface area, pore volume and average pore diameter of catalysts

Catalysts	S_BET/(m²·g^-1)	V/(m³·g^-1)	D/nm
Al₂O₃	196	0.425	4.7
8IMNi-Al	147	0.215	4.3
2Ni-Al	183	0.283	4.0
4Ni-Al	179	0.258	4.3
6Ni-Al	173	0.237	4.3
8Ni-Al	165	0.227	4.3
10Ni-Al	155	0.203	4.4

Fig. 1 XRD patterns of the catalysts

Fig. 2 H2-TPR profiles of the catalysts

Fig. 3 CH4 (a) and CO2 (b) conversions and H2/CO ratio (c) versus Ni content (GHSV=14400 mL/(gcat•h))

Fig. 4 CH4 (a) and CO2 (b) conversions and H2/CO (c) versus Ni content at various GHSV (T=800 ℃)

Fig. 5 Long term stability test for the catalysts 8IMNi-Al and 8Ni-Al

Fig. 6 TG curves (a), XRD patterns (b), Raman spectra (c), and TPHspectra (d) of the endurance-tested catalysts

Fig. 7 TEM images of the catalysts 8IMNi-Al before (a) and after (b) reaction, and 8Ni-Al before (c) and after reaction (d)

References 17

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Preparation of Ni-Al₂O₃Catalysts by Solution Combustion Method for CO₂ Reforming of CH₄

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